I know on the 2012 Rubi the shocks are adjustable. I used the standard rubi shocks after putting a 2.5" Rubicon Express Lift on. I would imagine the '13 is the same.
Any shock that is longer will provide droop.The real question is are the stock red rubi shocks suitable for a 2" lift. as I understand it, a Bilstein 5100 can provide more "droop" when combined with a longer coil. If the rubi shock is longer than the sport shock than it too would improve "droop".